A013011 Expansion of e.g.f. log(cos(x) + tan(x)).

0, 1, -2, 7, -28, 185, -1352, 12367, -129568, 1558865, -21053312, 316097527, -5218724608, 94003171145, -1834214761472, 38543705698687, -867787269787648, 20840298552277025, -531768169691512832, 14366953364916735847, -409720712943913074688

Offset

0,3

Links

Vincenzo Librandi, Table of n, a(n) for n = 0..200

Example

x - 2/2!*x^2 + 7/3!*x^3 - 28/4!*x^4 + 185/5!*x^5 ...

Mathematica

With[{nn=25}, Drop[CoefficientList[Series[Log[Cos[x] + Tan[x]], {x, 0, nn}], x] Range[0, nn]!]] (* Vincenzo Librandi Jul 30 2018 *)

Prog

(PARI) x = 'x + O('x^30); concat([0], Vec(serlaplace(log(cos(x) + tan(x))))) \\ Michel Marcus, Jul 30 2018

Crossrefs

Sequence in context: A334613 A365559 A123026 * A013181 A191478 A321181

Adjacent sequences: A013008 A013009 A013010 * A013012 A013013 A013014

Keyword

sign

Author

Patrick Demichel (patrick.demichel(AT)hp.com)

Extensions

a(0)=0 inserted and title improved by Sean A. Irvine, Jul 30 2018

Status

approved